National Park Service U.S. Department of the Interior Natural Resource Program Center Allegheny Portage Railroad National Historic Site

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Date: 2010-09-10 12:28:53 Johnstown Pennsylvania Allegheny Portage Railroad Johnstown Flood Palmer Drought Index Laurel Highlands Pittsburgh Johnstown (city) New York Portage Indiana Staple Bend Tunnel Pennsylvania Geography of the United States Droughts		National Park Service U.S. Department of the Interior Natural Resource Program Center Allegheny Portage Railroad National Historic Site Add to Reading List Source URL: science.nature.nps.gov Download Document from Source Website File Size: 1,93 MB Share Document on Facebook

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